Hand-operated air pump and the like



Oct. 18, 1932. F. E. HALL 1,882,827

HAND OPERATED AIR PUMP AND THE LIKE Filed April 8, 1931 Patented Oct. 18, 1932 UNITED: STATES, PATENT OFFICE FREDERICK E. HALL, OF NORTH EASTON, MASSACHUSETTS, ASSIGN OR TO THE CHASE COMPANIES, INCORPORATED, OF WATERBURY, CONNECTICUT, A'CORPORATION HAND-OPERATED AIR PUMFAND'THE LIKE application filed April 8, 1931. Serial No. 528,619.-

This invention relatesto an improvement in pumps, and particularly to hand-operated reciprocating air-pumps such as tire-pumps, etc., though not so limited. i g

The main object of my present invention is to provide a reciprocating pump at a low cost for manufacture, with simple, reliable and effective lubricating-means.

Another object of my invention is to pro-.

vide a pump with durable and effective means for checking the upstroke of the plunger with the minimum of shock. and noise. I With the above and other objects iniview as will appear from the following, my -invention consists in a reciprocating pump having certain details of construction and combinations and arrangements of parts as will be hereinafter described and particularly recited in the claims.

In the accompanying drawingzf Fig. l is, a view in side elevation of a reciprocating tire-pump embodying my invention; 1 t

Fig. 2 isa broken 'view, onjaj larger scale, in vertical longitudinal section, taken on the .line 2-2 of Fig. 1, and showing the plunger in its depressed position; v

Fig. 3 is a corresponding view, but showing the plunger at the limit of its upward stroke and the conical oil-reflector in engagement withthe absorbent oil-storage pad;

Fig. 4 is. a perspective view of the oil-storage pad detached; f Fig. 5 is a perspective view of the oildeflector detached; and e .1

Fig. 6 is a broken central longitudinal sectional view substantially corresponding to Fig. 3 but showing another form which my invention may assume. t V

For the illustration of my invention I have herein chosen a tire-pump comprising the usual features, consisting, as herein shown, of a foot-plate 10 secured in any approved manner to the lower end of a tubular sheetmetal cylinder 11, which latter is provided at its [upper end with externalthreads 12- for inter-engagement with threads 13 formed upon the inner periphery oftheskirt 14 of a sheet-metal cap 15., j v

The skirt-portion 14 of the cap 15 is, as shown, made smaller in diameter than the upper end of the cap to provide a retainin shoulder 16 for the retention of an absor ent oil-storage pad 1 7 which will be hereinafter described in detail.

The cap 15 is also provided with an upstanding-boss 18 providing a chamber 19 and formed withan axial passage 20 for the guidance of a plunger-rod 21 which latter is pro- 22. t The plunger-rod 21,- above referred to, passes through an' axialp assage 23 formed in the pad 17 and is provided at its lower end with the usual piston consisting of a cup-shaped flexible Washer 24 clamped between a pair of complementary washers 25 and 26 which are, in turn, respectively engaged by clamping-nuts 27 and 28 applied to thp1 threaded lower end 29 of the said plungerro Mounted upon the upper surface of the washer 25 is a conical oil-deflector 30 preferably formed of sheet-metal so astohouse the nut 27 and having its upper edge snapped into an annular groove or recess 31 formed in the plunger-rod 21 at. a point slightly above the washer 25 and nut 27. The fitting of the upper edge of the conical oil-deflector 30 into the groove 31 serves to prevent its axial displacement in an up ward direction while thebearing of its low er edge upon the washer 25 serves to prevent its downward axial displacement.

The oil-storage pad 17 before referred oil-deflector 30 will be brought into engagement with the surface of the conical recess 32 in the pad 17 so as to deflect the latter slightly upward into theChiLIIlbGl 19, with the result that a modicum of the oil stored in the said pad will be squeezed out and caused to flow down the. surface of the said deflector 30 to a position adjacent the inner vided at its upper end with the usual handle 1,. In a reciprocating pump, the combinetion with the cylinder-unit and plungenumt flector carried surface of the cylinder 11 where it is most required to lubricate the same and maintain the cup-shaped-washer 24 in a soft and pliable condition.

Furthermore, by virtue of the conical form of both the oil-deflector and the recess 32 in the pad 17, the upward stroke of the plungerrod 21 will be checked with the minimum of shock and noise.

It will be understood'by those skilled in the art that my invention may assume varied physical forms without departing'from my inventive concept and I, therefore, do not limit myself to the specific embodiment herein chosen for illustration, but only as indicated in the appended claims.

. I claim: 1 7

thereof; of an absorbent oil-storage pad carried by one of the said units; and a tapered oil-deflector carried by the other of the said units; the said pad and the said tapered oil; deflector being located within the pump structure in position to interengage as the said plunger-unit approaches the limit of its reciprocating movement to displace oil from the said pad toward the inner surface of the said cylinder-unit. i

- 2. In a reciprocating pump, the combination with a cylinder-unit and plunger-unit thereof; of an absorbent oil-storage pad carried by one of the said units and formed witha tapered recess; and a tapered oildeby the other of the said units; the said pad and the said tapered oil-deflector being located within the pump structure in position to cause the entry of the said defiector into the tapered recess in the said pad as the said plunger-unit approaches the limit of its reciprocating movement to displace oil from the said pad toward the inner surface of the saidcylinder-unit.

' 8. In a reciprocating pump, the combination with a c linder-unit and lun erunit' thereof; of an absorbentoil-storage pad carried by the said cylinder-unit; and a; tapered oil-deflector carried by the said plunger-unit; the said pad and the said tapered oil-deflector being located within the pump structure in position to interengage as the said plunger-unit approaches the limit of its reciprocating movement to displace oil from the said pad toward the inner surface of the said cylinder-unit, e

4. In a reciprocating pump, the combination with a cylinder-unit and plunger-unit thereof; of an absorbent oil-storage pad car- .ried by the said cylinder-unit and formed with a tapered recess; and a tapered oildeflector carried by the said plunger-unit;

the said pad and the said tapered oil-deflector being located within the pump structure in position to cause the entry of the said deflector into the tapered recess in the said fflector carried by the said plunger; the said pad and the said tapered oil-deflector being located within the pump structure in position tointerengageas the said plunger approaches the limit of its reciprocating movement todisplace oil from the said pad toward the surface of the said cylinder.

'6. In a reciprocating pump, the combination with a cylinder, a cap therefor; and a plunger; of an absorbent oil-storage pad mounted in thesaid cap and formed with a tapered recess and a tapered oil-deflector carried by the said plunger; the said pad and the said tapered oil-deflector being located within the pump structure in position to cause the entry of the said deflector into the tapered recess in the saidpad as the said plunger approaches the limit of its reciprocating movement to displace oil from the said pad toward the inner surface of the said cylinder.

7. In a reciprocating pump, the combination with the cylinder, a cap therefor, and a plunger; of an absorbent oil-storage pad mounted in the said cap with its central portion free for fiexure in an axial direction; a tapered oil-deflector carried by the said plunger; the said pad and the said tapered oil-deflector being located within the pump structure in" position to interengage as the said plunger approaches the limit of its reciprocating movement to displace oil from the said pad toward the'surface of the said cylinder,

8. In a reciprocating pump, the combination with a cylinder, a cap therefor, and a plunger; of anabsorbent oil-storage pad mounted in the saidcap with its central portion free for flexure in an axial directionand formed with atapered recess; and atapered oil-defiector carried by the said plunger; the saidpad and the said tapered oil-deflector being located within the pump structure in position to cause the entry of the said deflector, into the tapered recess in the, said pad as the saidplunger. approaches the limit of its reciprocating movement to displace oil from the said pad toward the inner surface of the said cylinder.

a '9. In a reciprocating pump,the combination with a cylinder and a plunger formed defiector mounted upon the said plunger and having its upper edge seated in the anchoring-recess therein; the said pad and the said tapered oil-deflector being located within the pump structure inposition to interenga-ge as the said plunger approaches the limit of its reciprocating movement to displace oil from the said pad toward the inner surface of the said cylinder. v I

10. In a reciprocating pump, the combination with a cylinder, a cap therefor, and a plunger including a piston and a rod extending through the said cap; of an absorbent oilstorage pad mounted in the said cap above the said piston and provided with a passage through which the rod of the said plunger specification.

FREDERICK E. HALL. 

